Remove "MQTTESP" from repository list

Due to irresponsible behavior, registry privileges have been revoked for `github.com/kelasrobot`.

Author: per1234

repositories.txt

@@ -7670,7 +7670,6 @@ https://github.com/alfan459/RandomForestModel
 https://github.com/alfan459/ElasticNetModel
 https://github.com/alfan459/LinearRegressionModel
 https://github.com/kelasrobot/KelasRobotTime
-https://github.com/kelasrobot/MQTTESP
 https://github.com/bsrahmat/iotNetESP32
 https://github.com/ajangrahmat/ArduMekaWiFi
 https://github.com/eis-interbot/EIS_INTERBOT